Spanish online acronym for "muy terrible joto," which in English means "very terrible faggot." An extreme insult to any online user, especially to the latin population. May either be highly useful or worthless against non-Latin Americans who will have no clue what you're saying.

On forums...
FireCrotch: "Teams can only have three major league keepers for Season 6."

On xat...
Kiss-Kiss (on xat): That guy with the crotch on fire is one mtj.